Patients with diabetes mellitus are complex and may benefit from the input of multiple specialists and PCPs must determine the need for and coordinate the input from those multiple specialists. With that in mind, the three objectives of the study are: 1) To assess the impact of computer-assisted access to specialist expertise (CASE) on process of care for patients with diabetes mellitus; 2) To assess the impact of CASE on outcomes of care at the patient level (clinical outcomes and satisfaction), provider level (satisfaction) and the system level (health services utilization and costs); and 3) To characterize the consultation-referral process in community-based outpatient clinics (CBOCs).